// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using Microsoft.AspNetCore.Components.Rendering;
using Microsoft.AspNetCore.Components.Sections;

namespace Microsoft.AspNetCore.Components.Web
{
    /// <summary>
    /// Enables rendering an HTML <c>&lt;title&gt;</c> to a <see cref="HeadOutlet"/> component.
    /// </summary>
    public sealed class PageTitle : ComponentBase
    {
        /// <summary>
        /// Gets or sets the content to be rendered as the document title.
        /// </summary>
        [Parameter]
        public RenderFragment? ChildContent { get; set; }

        /// <inheritdoc/>
        protected override void BuildRenderTree(RenderTreeBuilder builder)
        {
            builder.OpenComponent<SectionContent>(0);
            builder.AddAttribute(1, nameof(SectionContent.Name), HeadOutlet.TitleSectionOutletName);
            builder.AddAttribute(2, nameof(SectionContent.ChildContent), (RenderFragment)BuildTitleRenderTree);
            builder.CloseComponent();
        }

        private void BuildTitleRenderTree(RenderTreeBuilder builder)
        {
            builder.OpenElement(0, "title");
            builder.AddContent(1, ChildContent);
            builder.CloseElement();
        }
    }
}
